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Consistency in Floodplain Mapping

Consistency in Floodplain Mapping. Stormwater Management Division. HISTORY of SFWMD. In 1948 U.S. Congress adopted legislation creating the Central and Southern Florida Flood Control Project (C&SF) In 1949, the Florida Legislature followed suit

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Consistency in Floodplain Mapping

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  1. Consistency in Floodplain Mapping Stormwater Management Division

  2. HISTORY of SFWMD • In 1948 U.S. Congress adopted legislation creating the Central and Southern Florida Flood Control Project (C&SF) • In 1949, the Florida Legislature followed suit • In 1972, with the Florida Water Resources Act (Chapter 373), the state created five water management districts • With responsibilities for regional water resource management, environmental protection; and districts' boundaries determined by watersheds and other natural, hydrologic, and geographic features

  3. SFWMD Facts • 17,930 mi2 (~30%) • > 6 million residents (~45%) • 16 Counties • 1969 mi canals & levees • 127 NFIP communities • 25 major pumping stations • ~200 larger and 2,000 smaller water control structures • Staff of 1,771 • 9 Service Centers • 8 Field Stations

  4. SFWMD HISTORY with FEMA • Fall of 2003 signed a Memorandum of Agreement (MOA) with FEMA to become a Cooperative Technical Partner (CTP). • Mapping Activity Statement (MAS) No. 1: a joint effort between FEMA, the SFWMD, and Miami-Dade County for the restudy and mapping of the C-4 and C-6 Canal Basins. • MAS No. 2 is for the creation of an Arc Hydro geospatial database and vertical datum conversion for Palm Beach County. • MAS No. 3 is to develop a Digital Flood Insurance Rate Map (DFIRM) and Flood Insurance Study (FIS) report for Broward County.

  5. South Florida’s MAP-MOD Program Goals • Assist in migration of vertical datum from NGVD 29 to NAVD 88 • Develop and maintain DFIRMs • DFIRM adopted by local governments • Develop Arc-Hydro (AHED) geo-spatial data bases for all our counties

  6. SFWMD MAS # 1 • Pilot canal study • C-4 & C-6: Miami-Dade County • H&H by Miami-Dade • QA/QC by SFWMD • Use Arc Hydro Tools to automate QA/QC • Populate AHED to run models

  7. Federal Consensus on Map Modernization • Different conditions mandate different modeling needs and costs • Insure that FEMA’s map modernization program achieves its intended benefits • Look at different resources to assist in flood mapping • South Florida unique • Flat terrain requires more detailed topo • Groundwater must be included in models

  8. Topography Very flat, very low elevation lands require high accuracy topography (RMSE <2 ft)

  9. Soils & Hydrostatigraphy Transmissivity increases x 1000 going to south and integrated groundwater / surface water models are often needed

  10. Canals & Structures Artificial canals, looped networks and many structures (gates, culverts, weirs and pumps) require complex hydraulic models

  11. Landuse / Land Cover • Urban development stresses drainage systems designed for agriculture • FIRM maps require frequent updates

  12. 16 Counties 43% of the population of Florida (2.5% of the US), 70% of the policies in Florida (29% of the US), 42% of the flood loses in Florida, and 35% of the total dollars paid historically in Florida

  13. Flood Insurance by County in SFWMD

  14. FEMA’s DFIRM Production by County • Charlotte County – A new DFIRM with a standard FEMA database has been completed (effective DFIRM date of May 5, 2003). Charlotte County presently meets FEMA’s Map Modernization standards. • Collier County – A new DFIRM product is nearing completion and will have a final DFIRM effective date in FY 2006. A new base map and standard DFIRM database development are still required for this county to meet FEMA’s Map Modernization standards.

  15. FEMA’s DFIRM Production by County • Lee County – A new DFIRM project is underway, and the preliminary DFIRM product for the county is scheduled for distribution in FY 2005. This product will meet FEMA’s Map Modernization standards. • Martin County – A new preliminary DFIRM with a standard FEMA database was issued on February 6, 2004. Adoption of the DFIRMs by Martin County should occur in FY 2006. Martin County presently meets FEMA’s Map Modernization standards.

  16. FEMA’s DFIRM Production by County • Miami-Dade County – A new DFIRM project, which will map the results of several of the county’s stormwater master plans, is underway. The preliminary DFIRM product for the county is scheduled for distribution to the communities in FY 2005, and it will meet FEMA’s Map Modernization standards. However, the vertical datum will remain NGVD 1929. • Monroe County – A new DFIRM has been completed with an effective date of February 18, 2005. A standard FEMA database will be issued in FY 2005. Monroe County presently meets FEMA’s Map Modernization standards.

  17. FEMA’s DFIRM Production by County • Orange County – The County presently has DFIRMs without the FEMA standard database. The FEMA Region IV Indefinite Delivery Indefinite Quantity (IDIQ) contractor is presently tasked with development of new DFIRMs that will include new flood data based on existing county stormwater studies. • Osceola County – A new DFIRM became effective on May 7, 2001, while a standard FEMA database was issued in FY 2003. Osceola County presently meets FEMA’s Map Modernization standards.

  18. FEMA’s DFIRM Production by County • Palm Beach County – A DFIRM project is underway. Revised preliminary DFIRMs for the county, reflecting changes in the C-51 and adjacent basins, are scheduled for distribution in FY 2005. This DFIRM product will not meet FEMA’s Map Modernization standards because the base map being used is not sufficient for database development. Polk County - The County presently has DFIRMs without the FEMA standard database. A new base map will be required before the standard DFIRM database can be applied.

  19. Activities in SFWMD’s Map-Mod Business Plan • Scoping • Outreach • Training and Education • H & H Modeling • DFIRM Production • QA/QC • IT System Development • Program Management • This vision entails performing all the activities as presently required by FEMA for the production and adoption of DFIRMs.

  20. Activities in SFWMD’s Map-Mod Business Plan Scoping • Flood data analysis • Interviews • Reconnaissance • Initiate stakeholder involvement • Develop outreach strategies • Governmental officials

  21. Activities in SFWMD’s Map-Mod Business Plan Outreach • Service centers • Coordinate with communities as watershed models are performed • Gather stakeholder support • Assure adoption of DFIRMs

  22. Activities in SFWMD’s Map-Mod Business Plan Training and Education • Use service centers • Train staff • NFIP compliance • Insurance issues • Letters of map Change • Floodplain construction practices • Zone determination • 44CFR, part 66 requirements

  23. Activities in SFWMD’s Map-Mod Business Plan H & H Modeling • Update existing and develop new models based on funding • Develop Arc-Hydro data base

  24. Activities in SFWMD’s Map-Mod Business Plan DFIRM Production • Manage and produce DFIRM products for those communities that do not meet FEMA’s Map Modernization standards • Include adoption of the GIS-based DFIRMs

  25. Activities in SFWMD’s Map-Mod Business Plan QA/QC • All H & H data • Topo mapping • Floodplain mapping • All QA/QC activities for DFIRM production

  26. Activities in SFWMD’s Map-Mod Business Plan IT System Development • Geo-spatial data base maintained on central server • Make data available through FEMA’s Mapping Information Platform • Use FEMA’s web portal • Central repository of DFIRM products

  27. Activities in SFWMD’s Map-Mod Business Plan Program Management • Align community missions to reduce vulnerability to floods and other hazards. • Combination of SFWMD staff and contractors • Maintain goals, roles and data standards • Track status, schedules

  28. “Shared Counties” • Orange • Osceola • Okeechobee • Polk • Highlands • Charlotte

  29. SFWMD Map-Mod Production SequencingCounties shared with other WMDs SFWMD 34% SWFWMD 66% Charlotte SFWMD 69% SWFWMD 31% Highlands SFWMD 87% SJRWMD 13% Okeechobee SFWMD 35% SJRWMD 65% Orange SFWMD 65% SJRWMD 35% Osceola SFWMD 21% SWFWMD 79% Polk MMMS 2005 2006 2007 2008 2009 2010 2011

  30. The unique arrangement with FEMA and the state of Florida • FEMA partners with each Water Management District (WMD) on an individual basis • Each WMD has unique regulatory program • Each WMD has unique priorities • Each WMD is funded differently by FEMA • Issues with shared counties

  31. WMD Summits WMDs working together on competitive grants: • Multi-lingual outreach materials • Rainfall analysis on state-wide basis • Consistent approach • Shared roles and responsibilities

  32. WMD Summits Use of DFIRMs • Regulatory program • TMDLs and water quality • Flood control projects • “Shared” counties • Data bases and modeling • Easier maps in the future

  33. SFWMD Map-Mod Production Sequencing Funding by Fiscal Year ($1,000s) Lee, Martin and Monroe are presently unfunded Broward$1,000 Collier$500 Dade$200 Miami-Dade $300 Glades$500 Hendry$500 Palm Beach$500 St. Lucie$1,000 MMMS 2005 2006 2007 2008 2009 2010 2011 Source: November 2004 Multi-Year Flood Hazard Identification Plan (MHIP)

  34. SFWMD Map-Mod Production SequencingCounties shared with other WMDs Funding by Fiscal Year ($1,000s) SFWMD 34% SWFWMD 66% Charlotte$500 SFWMD 69% SWFWMD 31% Highlands$600 SFWMD 87% SJRWMD 13% Okeechobee$500 SFWMD 35% SJRWMD 65% Orange$755 SFWMD 65% SJRWMD 35% Osceola$1,000 SFWMD 21% SWFWMD 79% Polk$250 2005 2006 2007 2008 2009 2010 2011

  35. Thank You

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